Millions watched Donald Trump's inauguration from home, per Nielsen ratings

Videos and images on social media are comparing Donald Trump's inauguration crowd to Barack Obama's. But that's just half the story.

According to the Nielsen Co., which tracks TV-watching habits, a lot of people watched the inauguration from home — nearly 31 million.

SEE MORE: What Trump Fans (And Critics) Are Expecting From His Presidency

Nielsen didn't factor in online streaming, so viewership of the inauguration might have been even higher.

That number surpasses the inaugurations for George W. Bush, George H.W. Bush and Bill Clinton, but not Obama's first inauguration.

RELATED: Inaugural balls to honor President Donald Trump

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Inaugural balls to honor President Donald Trump
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Inaugural balls to honor President Donald Trump

U.S. President Donald Trump and first lady Melania Trump attend the Liberty Ball in honor of his inauguration in Washington, U.S. January 20, 2017.

(REUTERS/Jonathan Ernst)

President Donald Trump, First Lady Melania Trump, Vice President Mike Pence and Karen Pence dance with members of the armed services at the A Salute to Our Armed Services Ball on January 20, 2017 in Washington, D.C. Trump will attend a series of balls to cap his Inauguration day.

(Photo by Kevin Dietsch - Pool/Getty Images)

The Rockettes perform at the Freedom Inaugural Ball at the Washington Convention Center January 20, 2017 in Washington, D.C. President Trump was sworn today as the 45th U.S. President.

(Photo by Aaron P. Bernstein/Getty Images)

U.S. President Donald Trump applauds while flanked by his wife Melania (L) and his son Donald Jr. (R) at his "Liberty" Inaugural Ball in Washington, U.S., January 20, 2017.

(REUTERS/Brian Snyder)

U.S. President Donald Trump, his wife Melania, Vice President Mike Pence and his wife Karen dance with army services members at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

U.S. first lady Melania Trump dances with army services member at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

Ivanka Trump and her husband, Jared Kushner, dance along with U.S. President Donald Trump and his wife, first lady Melania Trump (not pictured), at the president's "Liberty" Inaugural Ball in Washington, DC January 20, 2017.

(REUTERS/Brian Snyder)

Singer Erin Boheme performs at the "Liberty" Inaugural Ball being held for U.S. President Donald Trump and his wife, first lady Melania Trump, in Washington, U.S., January 20, 2017.

(REUTERS/Brian Snyder)

U.S. President Donald Trump and first lady Melania Trump, along with the older Trump children and their spouses, attend the Liberty Ball in honor of his inauguration in Washington, U.S. January 20, 2017.

(REUTERS/Jonathan Ernst)

Trump supporters celebrate as they attend the Inauguration Freedom Ball being held for U.S. President Donald J. Trump and first lady Melania Trump in Washington, U.S., January 20, 2017.

(REUTERS/Lucy Nicholson)

President Donald Trump and First Lady Melania Trump attend the Liberty Inaugural Ball on January 20, 2017 in Washington, DC. The Liberty Ball is the first of three inaugural balls that President Donald Trump will be attending.

(Photo by Rob Carr/Getty Images)

Gospel Singer Travis Greene (L) and R&B singer Chrisette Michele (R) perform at the "Liberty" Inaugural Ball being held for U.S. President Donald Trump and his wife, first lady Melania Trump, in Washington, U.S., January 20, 2017.

(REUTERS/Brian Snyder)

U.S. Vice President Mike Pence (C) helps his wife Karen Pence down the steps of the front porch of the vice presidential residence at the U.S Naval Observatory before heading to the inaugural balls with their children January 20, 2017 in Washington, DC. The ball is part of the celebrations following the inauguration of Pence and U.S. President Donald J. Trump.

(Photo by Chip Somodevilla/Getty Images)

U.S. President Donald Trump with his wife Melania and Vice President Mike Pence with his wife Karen cut a cake at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

Preparations are made for U.S. President Donald J. Trump and first lady Melania Trump at the Inauguration Freedom Ball in Washington, U.S., January 20, 2017.

(REUTERS/Lucy Nicholson)

US President Donald Trump and the first lady Melania Trump dance at the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017.

(JIM WATSON/AFP/Getty Images)

The Piano Guys perform at the Freedom Inaugural Ball at the Washington Convention Center January 20, 2017 in Washington, D.C. President Trump was sworn today as the 45th U.S. President.

(Photo by Aaron P. Bernstein/Getty Images)

US President Donald Trump speaks as first lady Melania Trump looks on during the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017.

(JIM WATSON/AFP/Getty Images)

A Military Color Guard presents on stage prior prior to the start of the Freedom Inaugural Ball at the Washington Convention Center January 20, 2017 in Washington, D.C. President Trump was sworn today as the 45th U.S. President.

(Photo by Aaron P. Bernstein/Getty Images)

Pelican212 performs at the Freedom Inaugural Ball at the Washington Convention Center January 20, 2017 in Washington, D.C. President Trump was sworn today as the 45th U.S. President.

(Photo by Aaron P. Bernstein/Getty Images)

WASHINGTON, DC - JANUARY 20: Vice President Mike Pence and President Donald Trump dance with their wives at the Liberty Inaugural Ball on January 20, 2017 in Washington, DC. The Liberty Ball is the first of three inaugural balls that President Donald Trump will be attending.

(Photo by Rob Carr/Getty Images)

U.S. President Donald Trump dances with his wife Melania at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

Ivanka Trump (R) dances with her husband Jared Kushner and Eric Trump dances with his wife Lara Yunaska during A Salute To Our Armed Services Inaugural Ball at the National Building Museum on January 20, 2017 in Washington, DC. President Donald Trump was sworn in as the 45th President of the United States today.

(Photo by Alex Wong/Getty Images)

A guest attends the Freedom Inaugural Ball at the Washington Convention Center January 20, 2017 in Washington, D.C. President Trump was sworn today as the 45th U.S. President.

(Photo by Aaron P. Bernstein/Getty Images)

U.S. President Donald Trump, his wife Melania, Vice President Mike Pence and his wife Karen dance with army services members at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

US President Donald Trump (C) gestures as the first lady Melania Trump (center L), Vice Presidant Mike Pence (L), his wife Karen (2L) and family look on at the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017.

(JIM WATSON/AFP/Getty Images)

A guest takes a picture at the "Liberty" inaugural ball for U.S. President Donald Trump and his wife, first lady Melania Trump, in Washington, U.S., January 20, 2017.

(REUTERS/Brian Snyder)

U.S. President Donald Trump and first lady Melania Trump thank guests during the Freedom Ball at the Washington Convention Center January 20, 2017 in Washington, DC. The ball is part of the celebrations following Trump's inauguration.

(Photo by Chip Somodevilla/Getty Images)

Ivanka Trump and her husband, Jared Kushner, dance along with U.S. President Donald Trump and his wife, first lady Melania Trump (not pictured), at the president's "Liberty" Inaugural Ball in Washington, DC January 20, 2017. REUTERS/Brian Snyder

Workers carry the presidential seal at the site of the Commander in Chief inaugural ball for President-elect Donald Trump in Washington, D.C. January 19, 2016.

(REUTERS/Rick Wilking)

WASHINGTON, DC - JANUARY 20: U.S. Vice President Mike Pence (C), his wife Karen Pence, their daughters Audrey (2nd L) and Charlotte (2nd R) and their son Michael and his wife Sarah pose for photographs on the front porch of the vice presidential residence at the U.S Naval Observatory before heading to the inaugural balls January 20, 2017 in Washington, DC. The ball is part of the celebrations following the inauguration of Pence and U.S. President Donald J. Trump.

(Photo by Chip Somodevilla/Getty Images)

Supporters listen to U.S. President Donald Trump at the Freedom Ball in honor of his inauguration in Washington, U.S. January 20, 2017.

(REUTERS/Jonathan Ernst)

The Radio City Music Hall "Rockettes" perform at the "Liberty" Inaugural Ball held for U.S. President Donald Trump and his wife, first lady Melania Trump, in Washington, U.S., January 20, 2017.

(REUTERS/Brian Snyder)

US President Donald Trump and the first lady Melania Trump dance at the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017.

(MOLLY RILEY/AFP/Getty Images)

Guests wait for US President Donald Trump and First Lady Melania Trump dance at the Armed Forces ball at the National Building Museum on January 20, 2017 in Washington, DC.

(SAUL LOEB/AFP/Getty Images)

US President Donald Trump and the first lady Melania Trump dance at the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017.

(MOLLY RILEY/AFP/Getty Images)

U.S. President Donald Trump, his wife Melania, Vice President Mike Pence and his wife Karen dance at the Armed Services Ball in Washington, U.S., January 20, 2017.

(REUTERS/Yuri Gripas)

US President Donald Trump (2R) and the first lady Melania Trump (R) dance with Vice Presidant Mike Pence and his wife Karen at the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017.

(JIM WATSON/AFP/Getty Images)

A detailed view of the stage during A Salute To Our Armed Services Inaugural Ball at the National Building Museum on January 20, 2017 in Washington, DC. President Donald Trump was sworn in as the 45th President of the United States today.

(Photo by Alex Wong/Getty Images)

Ivanka Trump blows a kiss as she departs with her husband Jared Kushner from the Inauguration Freedom Ball in Washington, U.S., January 20, 2017.

(REUTERS/Lucy Nicholson)

United States Army Staff Sergeant Jose A. Medina dances with U.S. first lady Melania Trump (C) during the "Salute to Our Armed Services Ball" on Inauguration Day in Washington, D.C, U.S. January 20, 2017.

(REUTERS/Rick Wilking)

Vanessa Trump and her husband Donald Trump, Jr. and Ivanka Trump and her husband Jared Kushner watch U.S. President Donald Trump cut a cake during the inaugural Armed Services Ball at the National Building Museum January 20, 2017 in Washington, DC. The ball is part of the celebrations following the inauguration of Trump.

(Photo by Chip Somodevilla/Getty Images)

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Nearly 38 million people watched Obama take the oath of office in 2009.

President Ronald Regan holds the record with almost 42 million people tuning in to his ceremony in 1981.

Nielsen has been tracking inauguration viewers since 1969, and overall, Trump's total ranks fifth.

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